Battery-zinc.



PATBNTBD SEPT. 24, 1907.

E. G. THOMSON. BATTERY ZEIG. Arrmomxox mmm me, 21. mos.

UNITED STATES PATENT OFFICE HENRY o. THOMSON, OF BOSTON, MASSACHUSETTS, ASSIONOR TO ELECTRIO ois nomme COMPANY, OF BOSTON,- MsssAOHUsETTs.

BATTERY-ZINC.

Specification of Letters Patent.

Patented Sept. 24, 1967.

Ay'zpllcation lied DOMEIN! 21, 1908. Bofill No. 185,973.

" understood 'from the rime mi spen'esgisvimsfwhich is placed the lernt-nt C, th whois @elimination being pro- 'v'ided with' ,various necessary eiements such as com dueting wires, binding screws, a cover for the jar, etc., sil of which muy be of any desired variety and are immaterial to my imreutioul wili now describe my invention. The action in presenco'of the liquid urnmnding the battery zincl @B is, of course; grad ly to consume thatv element, :51nd inumuh so greater oxidation of the zinc takes ipiwce at the inter -lineftlie effect is to est away the 36.. zinc at thatpoint and eventuallycut the zine in two.

Sometimes this oxidntion occurs more rapidly in one cell of a set o! batteries than in another, the result being om the making in we of um zin'c in me cell will,.open this circuit ofthe system in which the colis no being used. Sometimes only partial severance of the zinc will occur, thereby allowing n part.

of the zinc to fall against the carbon, which results in on internal short-cir'cuit, rapidly depleting the strength of the cell. Where it is thus eaten away is not materially reduced in Weight, and would sui-Hee for operation o the cell for a long time, this severing Of the zinc is very exper sive because it so greatly sliorteus and reduces the lifev of the battery. Various devices have been adopted for Overcoming this inconvenience and saving this loss,

vbut none of them, so Inr'as 4 know, have heen success fui. l have remedied this' difficulty hy forming the zinc B with the turned-Over lips bfi), thus doubling the amount of zinc at either Or eau-h oi the edges Oi the eirftuiar zinc. It is immaterial whother'theiip b is brought Asthe zinc above and below the point.

into or left siightiy, say less than 125 OI an inch, out of actual Contact with the zinc. By this simple device,

"the life of the zinc is doubled, innsmuvh as it will take 

